Anthony Clark will soon begin serving a 37-year prison sentence for shooting and killing 16-year-old Devondre Davis in September 2011.
Tacoma police later found the boy stuffed headfirst in a Tacoma garbage can.
Neighbors said Clark had asked if he could use their trash bin to dispose of a dead person.
"That he just killed somebody and there was a dead body in the house and if we would help him dispose of the body," one neighbor said shortly after the murder.
Several members of Davis' family were in court Friday to confront Clark.
"What Anthony did to Devondre was a demonic attack. It was not God's will for Devondre to be stuffed into a trash can, like garbage," said Davis' aunt, Angela Davis.
This was the second time in 18 years the Davis family had been in court for sentencing. Davis' father, Paul Davis, was shot in the head and killed when he was just 19-years old and Davis was an infant.
"You're evil. You are evil and I want you to hear those words for the rest of your life, evil," Angela Davis said.
Clark maintained his innocence throughout the trial. He claims Davis brought some cocaine and a handgun to his house and then somehow ended up getting shot in the head.
"I want everyone to know that Devondre was my friend and I did not intentionally kill him. I will live with the pain in my heart with what happened for the rest of my life," Clark said on Friday.
The Davis family sat quietly and wept while Clark spoke.
"I truly am sorry for what happened to your son. If I could rewind time to bring him back, I would. I truly am deeply sorry," Clark said.
The judge sentenced Clark to 37 years in prison. Prosecutors say it's fortunate Clark made the mistake of asking neighbors for help in disposing the body because they may have never found him otherwise.